| Popis: |
Swelling and shrinkage characteristic has a great significance when a structure is to be designed on problematic or expansive soil. Swelling is considered as a serious problem, when working with expansive soil cause of potential danger of unpredictable upheave of structures foundation. We can prevent such an unpredictable hazard by either of two things, first by removing such an expansive soil from the site and second by adopting some technical measures to retard the swelling behavior of such an expansive soil. Completely removing such soil and pouring new one is an expensive task and also not feasible on every site so here in this study extensive effort is made to overcome such a serious problem by reducing their expansive characteristics by chemical admixtures. Three chemicals namely potassium chloride (KCl), magnesium chloride (MgCl2), and ferric chloride (FeCl3) were used in different proportions in range of 0–2% by weight to know their influence characteristics on swelling properties of expansive soil. This chemical admixture has extremely good water-soluble attributes so that it provides high cation expansivity with soil. Extensive laboratory work was carried out to access the effect of these chemical admixtures on the swelling characteristics of the soil. A methodology including the basic properties of soil, compressibility, swelling, shrinkage was conducted as per IS codal provision with different content of additives to the test soil. The mineral concentration and reduction in the number of exchangeable cations of raw soil and clay-chemical complexes were studied by Energy Dispersion X-Ray (EDX). Ferric Chloride is proven to be the best additives among the three with respect to reducing swelling and shrinkage of expansive soil. |
